Surfacing machine



July 3, 1923.

J. 'A; CAMPBELL SURFAOING MACHINE Filed Ha ch 25. 1922 7 an w.

Y W llllllk Patented July-3, 1923. v

UNITED STATES JOHN A. CAMPBELL, or Quincy, n nssncnosnrrssusracmc MACHINE: 1

Application filed March 25, 1922. Serial No. 546,536.

To all whom it may concern.

Be it known that 1, JOHN A. CAMPBELL, a citizen of the United States, residing at Quincy, in the county of Norfolk and State of Massachusetts, have invented new and useful Improvements in Surfacing Machines, of which the following is a specification.

This invention relates to a machine Which includes a wheeled platform or body, adapted to be moved over a floor, and a surfacing roll supported by the body and having an abrasive periphery contacting withthe floor to be surfaced, the body being provided with a motor, a centrifugal blower adapted to draw dust from the vicinity of the roll, and driving connections between the motorand the shafts of the surfacing roll and the blower. I

The object of the invention is to provide an improved construction whereby a simple and effective machine is produced, adapted to collect the dust removed from the blower by the surfacing roll, and prevent the same from escaping into the room in which the machine is being used.

The invention is embodied in the improvements which I will now proceed to describe and claim.

Of the accompanying drawings forming a part of this specification,-

Figure 1 is a top plan view of a surfacing machine embodying my invention.

Figure 2 is a side elevation of the. same.

Figure 3 is a fragmentary section on line 33 of Figure 1. v j

Figure 4 is a perspective view, showing in full lines the arms which support the surfacing roll, the hood hereinafter described being shown by dotted lines;

The same reference characters indicate the same parts in all of the figures.

In the drawings, 12 represents a platform constituting the main portion of the body of the machine. The platform is supported by a pair of traction wheels 13, arranged to support the platform in a raised position above a floor 14. said wheels being located under the platform and preferably coni nected with the latter by means rendering the wheels vertically adjustable independently of each other. As here shown the platform is provided with downwardly projecting brackets 15, having vertical slots 16 in which the axle arms 17 on which the wheels rotate are vertically adjustable.

Rig-idly secured, as by bolts 18,

forward end portion of theplatform 12,"are

wardly projecting upper portions, anddownwardly projecting lower portions... Said arms are preferably connected by a neck or web 20,"whi ch engages the attaching bolts 18. Thelower portions of the arms 19are provided with alined shaft bearings 21,

which may, if desired, be anti-friction bearmaterial. "The roll may be of any sitable construction, permitting the application and removal of the abraslve material orcover;

two ri id spaced apart arms 19, havingfor As here shown, the roll includes two semi cylindrical sections 24, hinged together-{at swinging edges of the sections to clamp the ends of the sheet forming the cover. I

. The diameter of the roll issuchthat its lower portion projects below the lower ends .25, and forming a cylindrical shelhadapted to be opened and closed, suitable means be; ing provided for detachably connectingthet of the arms 19,'and isadapted tobear on the fioor 14.

Supported bythe arms l9rlS a hood, preferably'composed of sheet metal, and having a top portion-.26 seated on 'the forwardly projecting portions of the arms -19, a fixed rear wall portion 27, located beyond andin closeproximity to thesurfacing roll, opposite end walls 28, one of which has an opening to receive the roll shaft 22. anda movable front wall 29,: hinged at 30 to the j top portion of the hood, and constituting a door or cover, adapted to be swung up- I ward and backward, as shown by'dotted lines in Figure 3, to open the hood. The

movable wall 29 is preferably provided with 5 flanges 31, overlapping. the end walls 28, so that when the door 29 is closed, a sub-. stantiallyair tight joint is. formed between it and the end walls 28. I i

The hood has an openlower endpwhich islocated slightly above the lowest'portion I of theperiphery of the surfacing roll, and

above the floor 14, so that a narrow-space v roll, excepting its lowest part, are enclosed" by the hood.

Mounted on the rear portion of the platform 12, is a centrifugal blower, of which 34 designates the casing, and 35 the shaft. 36 represents a conduit connecting the hood with the blower casing 34. Said conduit includes a fan-shaped portion 36 having a narrow oblong horizontal intake end 36*,

fitted in a narrow oblong horizontal open ing 27 in the lower end of the rear wall 27 of the hood. The fan-shaped portion 36? so tapers that its upper and lower walls diverge as shown by Figures 2 and 3, and

its lateral or edge walls converge as shown by dotted lines in Figure 1, as they recede from the intake end, and until they join the main conduit portion 36, which is of uniform diameter from end to end, and is" of suflicient internalicap'acity to conduct all the air entering the intake end 36*. The blower therefore acts through the fan- .shaped portion 31 to induce a flow of air which is concentrated at the intake end,

4 1 and removes from i the hood the entire volume of dust raised by the surfacing roll,

no dust being permitted to escape into the room. i t j v 37 represents the casing, and 38 the shaft "of a motor, preferably of the rotary electric type, mounted'on the platform between the rear and front'ends of the latter. The

motor casevis preferably adjustably connectedwith the platform, so that it may be moved endwiseof the latter, by means here shown as embodied in slots 39 in the platform, and bolts 40 engaged with ears '41 on the motor casing, and passing through said slots. a

The motor shaft 38 is connected with th roll shaft 22, and with the blower shaft 35,

-motor shaft," a sprocket wheel 43 on the by suitable driving connections, which prefera-bly include a sprocket wheel 42 on the roll shaft, a sprocket chain 44, indicated conventionally by dotted lines in Figure 2,

connecting the wheels 42 and 43, a pulley 45 on "the 'motor shaft, apulley 46 on the blower shaft, and a belt 47 connecting said preferably. enclosed in a sheet metal casof the platform 12 is provided with a short leg 49, and preferably with two of said legs, [as shown by Figure 1, projecting downward from the platform, and arranged to and for the hood.

bear on the floor and support the platform in an inclined position, as indicated by dotted lines in Figure 1. The hood and the roll are thus raised to a conveniently accessible position. The arrangement of the motor is such that when the platform is inclined, thecenter of gravity is shifted to maintain the inclination.

The relative arrangement of the surfacing roll, the hood, and the, intake of the conduit 36 is such that when the machine is in operation, no dust can escape from the hood, excepting through the conduit 36. This dust may be accumulated in a suitable receptacle 50, detachably secured to a discharge conduit 51, communicating with the blower casing.

By the employment of the arms 19, bolted to and projecting forward and downward from the platform, 12, I am enabled to use a platform of minimum length and weight, and at the same time provide a suitable support for the surfacing roll shaft The machine may be impelled by a handle bar 52, connected by arms 53 with the platform.

The brackets 15 may be adjustably secured to the platform 12 by means of bolts 54, engaged with the brackets and passing through slots 55 in the platform. Adjustable bearing screws 56 engaged with tapped orifices in a flange 57, on the front end of the platform, abut against the forward side of the motor casing 37, to limit the forward adjustment of the motor on the casing, and secure proper tension of the chain 48 I claim r a Y A surfacing machine comprising a platform, traction wheels, a surfacing roll, said roll and the traction wheels being arranged to support the platform raised above a floor, a hood enclosing the major portion of said roll, a centrifugal blower mounted on the platform, a conduit connecting the lower rear portion of the hood with the fan casing, and means carried by the platform for driving the roll and blower, the machine being characterized by angular arms bolted. to the forwardend of the platform and projecting forward and downward therefrom, said arms being provided with bearings for the roll shaft, and formed to operatively support the hood below the platform.

In testimony whereof I have affixed my signature.

- JOHN A. CAMPBELL, 

